计及优先级及电力平衡的新能源中长期交易电量分解方法

随着新能源发电占比以及参与市场交易的比例不断扩大,新能源发电的随机性和波动性导致现行按照电量平衡、电力校核的中长期交易电量分解方法难以适用于高比例新能源电力系统.文中提出了一种计及交易优先级及电力平衡约束的新能源中长期交易电量优化分解方法.首先,从新能源长时间出力曲线构建、交易电量协调优化分解和多场景模拟计算等方面提出满足新能源随机波动性的中长期交易电量协调优化方法.然后,以促进高比例新能源消纳为目标,计及交易优先级建立基于时序仿真的新能源中长期交易电量优化分解模型,实现新能源年度交易电量分解到月.最后,以中国西北地区某省级电网为例开展实例分析,结果表明所提方法可以确保分解结果的合理性和可执行性.     

电力系统可视化技术研究及应用

电网规模的增大和数据量的增多,需要更先进更直观的工具和手段来帮助调度员实现对电网的及时有效监控,可视化是目前从人机界面角度实现上述功能最有效的技术手段。文章阐述了可视化技术的发展历史以及可视化的技术理论基础。重点描述了一体化设计的可视化系统的几种展示手段和产品的特点。该系统已经在某省调EMS系统中得到应用。     

Solubility of heavy metals added to MSW

This paper aims to investigate the six heavy metal levels (Cd, Cr, Cu, Pb, Ni and Zn) in municipal solid waste (MSW) at different pHs. It intends to provide the baseline information of metals solubility in MSW co-disposed or co-digested with MSW incinerator ashes in landfill or anaerobic bioreactors or heavy metals contaminated in anaerobic digesters. One milliliter (equal to 1mg) of each metal was added to the 100ml MSW and the batch reactor test was carried out. The results showed that higher HNO3 and NaOH were consumed at extreme pH of 1 and 13 compared to those from pH 2 to 11 due to the comparably higher buffer capacity. Pb was found to have the least soluble level, highest metal adsorption (%) and highest partitioning Kd (lg(-1)) between pH 3 and 12. In contrast, Ni showed the highest soluble level, lowest metal adsorption (%) and lowest Kd (lg(-1)) between pH 4 and 12. Except Ni and Cr, other four metals seemed to show the amphibious properties as comparative higher solubility was found in the acidic and basic conditions.     

Some Observations on Sublimation and Decomposition of Ammonium Perchlorate

Ammoniumperchlorate (AP) was aged at 100 °C and 150 °C. Depending on the aging time, AP shows different decomposition characteristics. By a special experimental arrangement sublimation and thermal decomposition could be separated.     

Is ammonium perchlorate in composite solid propellant under strain?

Thermal decomposition of ammonium perchlorate-polystyrene propellant as a function of oxidizer loading has been found to behave in a fashion analogous to the thermal decomposition of ammonium perchlorate as a function of precompression pressure. It has been argued that the above behaviour of the propellant is due to the strain caused by the binder film on ammonium perchlorate contained in the propellant matrix. The presence of strain has been demonstrated independently by x-ray diffraction peak and infrared peak broadening and strain energy measurements.     

A full high-definition quantum dot light-emitting diode-on-silicon microdisplay

We report a 0.39-in. quantum dot light-emitting diode (QLED) microdisplay with full high-definition (FHD, 1920 × 1080) resolution by integrating a red top-emitting QLED on a complementary metal–oxide–semiconductor (CMOS) backplane. By optimizing the microcavity structure and constructing a suitable energy-level structure for the QLED devices, the performance of the large-area (4.9 × 8.7 mm²) top-emitting device with normal structure reached 13,936 cd/m² of brightness at 5-V bias with 13.3% external quantum efficiency (EQE). Notably, the optimal device showed a low turn-on voltage of 1.7 V, which matched well the voltage output of the CMOS backplane. Our work demonstrates the great promise of QLED microdisplays for applications in head-mounted augmented reality/virtual reality (AR/VR).     

Concentration Phase Separation of Substitution-Doped Atoms in TMDCs Monolayer

The density and spatial distribution of substituted dopants affect the transition metal dichalcogenides (TMDCs) materials properties. Previous studies have demonstrated that the density of dopants in TMDCs increases with the amount of doping, and the phenomenon of doping concentration difference between the nucleation center and the edge is observed, but the spatial distribution law of doping atoms has not been carefully studied. Here, it is demonstrated that the spatial distribution of dopants changes at high doping concentrations. The spontaneous formation of an interface with a steep doping concentration change is named concentration phase separation (CPS). The difference in the spatial distribution of dopants on both sides of the interface can be identified by an optical microscope. This is consistent with the results of spectral analysis and microstructure characterization of scanning transmission electron microscope. According to the calculation results of density functional theory, the chemical potential has two relatively stable energies as the doping concentration increases, which leads to the spontaneous formation of CPS. Understanding the abnormal phenomena is important for the design of TMDCs devices. This work has great significance in the establishment and improvement of the doping theory and the design of the doping process for 2D materials.     

形变热处理对2A12铝合金微观组织、织构及性能的影响

利用扫描电镜显微观察（含能谱分析）和电子背散射衍射技术（Electron Backscatter Diffraction， EBSD）等分析方法研究了不同形变热处理制度对2A12铝合金板材的微观组织、织构及性能的影响。结果表明：2A12铝合金经形变热处理后，晶粒沿轧制方向拉长，晶粒尺寸减小。随着形变热处理反复次数的增加，亚晶界比例降低，2°?15°的小角度晶界比例提高，大角度晶界比例先增后减，此时的退火过程由回复多边化主导转变为再结晶主导，再结晶程度提高。单步形变热处理样品因形变量较小，大小晶界和亚晶界比例较为接近。与退火制度相同的小变形样品相比，大形变热处理样品亚晶减少，大角度和小角度晶界增加，再结晶程度提高。形变量较大时，将存在Brass→R-Cu和m-Brass→Goss→R-Goss→Cube、T和P_0°→Near rotated Cube和｛102｝<201>的织构演变路径。单步小变形退火时，路径将改变为：R-Cu和m-Brass→Goss→R-Cube。随着变形量的增加，2A12铝合金的强度和硬度增加，韧性和塑性降低。     

Effect of Variables on Ignition Delays of hydrazone/nitric acid systems

The effect of relative amounts of fuel and oxidizer, composition of the oxidizer and compactness of the fuel on ignition delays of hydrazones with nitric acid has been studied. Several of the hydrazones give minimum ignition delays at the mixture ratio close to the stoichiometric ratio. Ignition delays of phenyl- and dimethylhydrazones are greatly influenced by the acid composition. Longer ignition delays are observed with the acids having higher concentrations of NO₂. A reaction mechanism leading to hypergolic ignition has been proposed for phenylhydrazones/nitric acid systems. Longer ignition delays are observed when the fuels are taken in compacted forms.